SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08f5b994e6ef8a5d77c2f1d055ca6171993f72283d9a6420e3ea21bb8bb42dce' 
  AND token = 'Ql8ZInkOwn9DIOEgQ0O6SVv5aoPvE+4ApnXtiVGqTFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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