SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '669c6838a1984d5cb839d9042764b7d9a85d536c4e1e96027a346d20f5cadffd' 
  AND token = 'JVIrCt5b9ZipXXc8ezahY5xLjgO2/B2TL1G83gx6lXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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