SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87fc20e11124e6d165277a228d5f247239872eb19ff57ab555ebc4db06d24ce2' 
  AND token = 'qhYyLhCBiBFyC8udA3SAvHFq/1j+TgZTHvdmo3b6Yeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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