SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e2630d156ef193bf172ede4c4265512a3a04b234be6aaf185c9c192542d6c60c' 
  AND token = 'O7qBYvKElCpFEz7yGuWzmChX2hr3AzcryGcAbY59j+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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