SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '524ea20873eebcca096c2d38640f24399c4ff9eb6a341850eecb16d28893ab92' 
  AND token = 'ALoKWEBLHgnHp1zjUXX/MYe7Dn5G0GS+wNiYDppd8vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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