SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36133eb7fd1d803d6d55a9e87bce1991001046e4eae4db8a2f32d7ff5f0ba97c' 
  AND token = 'vGBBeV7KC7YuMOyqQ9f4dsFQGGpP0JD37EibVZnVIXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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