SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd02d15c442277377304a2dc4785b1f474991a011ff970ef9c48d4f06164abec' 
  AND token = '9f29e5HZLgxAkx5TosQhuJraYVjb+tlN/fqrdWS1vqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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