SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1de7b038e65f81c80a6f1fa208520c21044bfb312ce6fc37e36691c72bb395b8' 
  AND token = 'ng/WCs0HFJ00gmJQYhAjnip/vdVufhMMHUBbGgQVcn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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