SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a40092a219b9a3fa5d39de118a04006753ff406186e1fd0368c6c6c03ed5cbae' 
  AND token = 'RB5hVm3gNHZL4F/rZ5qiKoZzXqI9Dn81E1hsg7COAEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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