can you try this code as your result
<?php
$userData = array("username" => "user_role_name", "password" => "user_role_password");
$ch = curl_init("http://your url/index.php/rest/V1/integration/admin/token");
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($userData));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, array("Content-Type: application/json", "Content-Lenght: " . strlen(json_encode($userData))));
$token = curl_exec($ch);
$ch = curl_init("http://testrexecom.humcommerce.com/index.php/rest/V1/products?searchCriteria[filter_groups][0][filters][0][field]=created_at&searchCriteria[filter_groups][0][filters][0][value]=2017-01-02 05:40:00.0000000Z&searchCriteria[filter_groups][0][filters][0][condition_type]=from&searchCriteria[filter_groups][1][filters][0][field]=created_at&searchCriteria[filter_groups][1][filters][0][value]=2017-11-23T11:06:00.0000000Z&searchCriteria[filter_groups][1][filters][0][condition_type]=to&searchCriteria[currentPage]=1&searchCriteria[pageSize]=100");
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "GET");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, array("Content-Type: application/json", "Authorization: Bearer " . json_decode($token)));
$result = curl_exec($ch);
$result = json_decode($result, 1);
echo '<pre>';print_r($result);