SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5fdc54d086e0d42d82cf66263bf44d462972476cf271f1372b265918bf488ca' 
  AND token = 'IU5XIvr5oiugBFqUOFK1djGlMHl+aWy9RpF4jPdUrN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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