SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b88af03d682ec371deb72641ce17df765313acd6bb21f8b618c54649d99743ff' 
  AND token = '7oQoGIK5NMqeCwF4HJTY5UapLhnXuQwH3aXQIIQzQNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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