SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4907d222901cd434af3854cd2e5909cbd623ba2322cdcdc47f57973f2ca25a0b' 
  AND token = 'YFhyJlYocqFKIoVQj1BlIJsEIVTGnm7WxA9xcWpWZF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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