Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55bf826364a1c9d07d6e7ac42954c4e3ba0a41a402475de7002f9dfdc0ee6d16' 
  AND token = '0JdN1zFlUwXYSaVqzpMa2VIQh4XgESZan4K7gI82NSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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