curl -X GET 'https://api.example.com/api-keys/apk_001' \
  -H 'Authorization: Bearer YOUR_TOKEN'

{
  "id": "apk_0190a1b2-c3d4-7e5f-8a9b-0c1d2e3f4a5b",
  "subjectId": "subject_api_key_001",
  "tenantId": "tenant_acme",
  "environmentId": "environment_prod",
  "name": "CI Pipeline",
  "description": "Used for automated deployments",
  "prefix": "qs_live_xxxx",
  "lastFour": "a1b2",
  "hashAlgo": "argon2id",
  "createdBySubjectId": "subject_jane",
  "createdAt": "2024-01-15T10:30:00Z",
  "expiresAt": "2025-01-15T10:30:00Z",
  "status": "active",
  "lastUsedAt": "2024-01-20T14:00:00Z",
  "lastUsedIp": "192.168.1.1",
  "intendedUse": "ci-cd",
  "metadata": {}
}