SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3187a59b55bb264fbc48f192b1456cddbb97b838ff07dc6c766c67d514897171' 
  AND token = 'nh+GZ1fTypnxZcUi7eAizW5BX04rT6sD8YsVR7wIXgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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