diff --git a/backend/crates/gateway-store/src/postgres/observability/queries/usage.rs b/backend/crates/gateway-store/src/postgres/observability/queries/usage.rs
index d1c1f7cc6..8eb62448b 100644
--- a/backend/crates/gateway-store/src/postgres/observability/queries/usage.rs
+++ b/backend/crates/gateway-store/src/postgres/observability/queries/usage.rs
@@ -88,7 +88,19 @@ pub(crate) fn push_usage_filter(
             query.push(format!(" escape '\\' or {alias}.{column} like "));
             query.push_bind(pattern.clone());
         }
-        query.push(" escape '\\')");
+        if value.starts_with("sk_") {
+            query.push(format!(
+                " escape '\\' or exists (
+                   select 1 from client_api_keys searched_client_key
+                    where searched_client_key.id = {alias}.client_api_key_ref
+                      and searched_client_key.key like "
+            ));
+            query.push_bind(pattern);
+            query.push(" escape '\\')");
+        } else {
+            query.push(" escape '\\'");
+        }
+        query.push(")");
     }
 }
 
diff --git a/backend/crates/gateway-store/tests/postgres/observability/mod.rs b/backend/crates/gateway-store/tests/postgres/observability/mod.rs
index 978e1e855..14daeedce 100644
--- a/backend/crates/gateway-store/tests/postgres/observability/mod.rs
+++ b/backend/crates/gateway-store/tests/postgres/observability/mod.rs
@@ -186,6 +186,48 @@ async fn usage_search_should_match_literal_prefix_instead_of_substring() {
     database.close().await;
 }
 
+#[tokio::test]
+async fn usage_search_should_match_client_api_key_prefix() {
+    let Some(database) = TestDatabase::create("usage_client_api_key_search").await else {
+        return;
+    };
+    let now = Utc::now();
+    seed_observability_facts(&database.pool, now)
+        .await
+        .expect("seed observability facts");
+    let plaintext_key = format!("sk_{}", "K".repeat(43));
+    sqlx::query(
+        "insert into client_api_keys (id, name, key, enabled, created_at, updated_at)
+         values ('key_observe', 'usage search', $1, true, $2, $2)",
+    )
+    .bind(&plaintext_key)
+    .bind(now)
+    .execute(&database.pool)
+    .await
+    .expect("seed searchable client API key");
+    let range = ObservabilityRange::new(now - TimeDelta::hours(1), now + TimeDelta::hours(1))
+        .expect("observability range");
+
+    for search in [plaintext_key.as_str(), &plaintext_key[..10]] {
+        let page = observability_repository(&database.pool)
+            .list_usage_records(UsageRecordQuery {
+                range,
+                filter: UsageRecordFilter {
+                    search: Some(search.to_owned()),
+                    ..UsageRecordFilter::default()
+                },
+                current_page: 1,
+                page_size: ObservabilityPageSize::new(10).expect("page size"),
+            })
+            .await
+            .expect("search usage by client API key");
+
+        assert_eq!(page.total, 1);
+        assert_eq!(page.items[0].id, "req_observe_success");
+    }
+    database.close().await;
+}
+
 #[tokio::test]
 async fn ops_search_should_treat_sql_wildcards_as_literals() {
     let Some(database) = TestDatabase::create("ops_literal_wildcard_search").await else {
diff --git a/frontend/src/views/usage/components/UsageFilters.vue b/frontend/src/views/usage/components/UsageFilters.vue
index 23d16abbb..e58eb4b21 100644
--- a/frontend/src/views/usage/components/UsageFilters.vue
+++ b/frontend/src/views/usage/components/UsageFilters.vue
@@ -19,7 +19,7 @@ const search = defineModel<string>('search', { required: true })
 <template>
   <div class="flex w-full items-center gap-3" role="group" aria-label="使用记录筛选与操作">
     <div class="min-w-0 flex-1 sm:w-96 sm:flex-none">
-      <BaseInput v-model="search" placeholder="请求、Key、账号或模型 ID 前缀" class="w-full">
+      <BaseInput v-model="search" placeholder="请求、API Key、账号或模型 ID 前缀" class="w-full">
         <template #prefix>
           <Search class="size-4.5 text-cp-text-tertiary" />
         </template>
diff --git a/frontend/src/views/usage/composables/useUsageRecordsTable.ts b/frontend/src/views/usage/composables/useUsageRecordsTable.ts
index 86dbcb5bf..ea736683d 100644
--- a/frontend/src/views/usage/composables/useUsageRecordsTable.ts
+++ b/frontend/src/views/usage/composables/useUsageRecordsTable.ts
@@ -21,6 +21,8 @@ interface UseUsageRecordsTableOptions {
 
 type UsageLoadScope = 'all' | 'table'
 
+const CLIENT_API_KEY_VISIBLE_PREFIX_LENGTH = 10
+
 interface UsageLoadOptions {
   scope?: UsageLoadScope
   background?: boolean
@@ -49,7 +51,7 @@ export function useUsageRecordsTable(options: UseUsageRecordsTableOptions) {
     ...(providerQuery.value ? { provider: providerQuery.value } : {}),
   })
   const filterParams = () => ({
-    search: searchQuery.value || undefined,
+    search: usageSearchParam(searchQuery.value),
   })
   const usagePagination = computed(() => ({
     currentPage: currentPage.value,
@@ -244,6 +246,15 @@ export function useUsageRecordsTable(options: UseUsageRecordsTableOptions) {
   }
 }
 
+function usageSearchParam(value: string) {
+  const search = value.trim()
+  if (!search)
+    return undefined
+  if (search.startsWith('sk_'))
+    return search.slice(0, CLIENT_API_KEY_VISIBLE_PREFIX_LENGTH)
+  return search
+}
+
 function emptySummary() {
   const summary: Awaited<ReturnType<typeof getUsageRecordSummary>> = {
     totalRequests: '0',