SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44cef9b8b6a1e024b1c0e07ef7ec44e71d6757c3fc1ea26a5aa60452d2d7161d' 
  AND token = '+hmurkTZjqlWjsLJIe+CNZ6ZCFcfuvsEfVJKhog/hgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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