SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1c931df93584bfb1dc041a2e6979cd46c2d34a3ffba809b6ce48f1ec220b5aa' 
  AND token = 'hJCLH5zOYcFmXTK2da2BKDYaqtYFAuLaKPZg4BC6VNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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