SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff3485796b56ce294a94f1307ea352b27ad88e900fae1e3b125d440f968943a7' 
  AND token = 'YqC0lcsJMWhiKsXsapYlFYyhKihofwAVKwZ5zqw2IHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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