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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92cdc1bdd720891671046def9d4cb6b3e72b0f1d615ac2986b97c99b974c69e3' 
  AND token = '5YQTKllAUJsyOnoDfCwG9v/7oJ/IX1aFUV7audVQ6kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}