SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77cf0944c291c70e2f634851ec472b2bb0d060a33f0be7f3214c656e572cfebd' 
  AND token = 'VimAT+XuYl42MLlepXkm2GzomSh/EsCrZkorrvMQ2Jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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