SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5935240596383afcfc7ce1bcbe3265e59a18c53dad542df2bc708b91f4f458f1' 
  AND token = 'YuLj3rbaUma+/sC8ouSWHEWsvgGbmDF+SguKqyBHnhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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