SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '865fe9bd313b996898c2663de2875eb78cd616dc572a9be3c64b6b3902817120' 
  AND token = '2VxRcnjps9zcfg4ZFavkZGvbOFKFyVDKGnRjwR6Wpjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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