SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '78afd5ba48ee95ac9bfa919fd675c964493273aff7619a3d9e5218f0efdb2527' 
  AND token = 'GihFXZRdSYCRxjYtw31f7hpUrkCL6u7MP/ig8e0A5GI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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