The importance of digital communications makes protecting data in transit a critical priority. Internet Protocol Security (IPsec) plays a central role in this protection, by ensuring data confidentiality, integrity, and authenticity. However, quantum computing threatens the foundations of IPsec. Its ability to efficiently solve mathematical problems such as factoring and discrete logarithms could break the public-key cryptography used for IPsec key exchange. Quantum Key Distribution (QKD) is one of the most promising solutions to this problem, offering a security layer immune to both classical and quantum computational attacks. This work proposes a solution that integrates emerging quantum technologies into existing security and communication infrastructures to ensure long-term protection. We combine IPsec with Software-Defined Networking and QKD to build a novel network security infrastructure. It is designed to resist both classical and quantum threats. It is based on recent standardization efforts and operational tools for QKD integration. We demonstrate advanced capabilities such as rekeying and secure key transport on a field deployed QKD network operating within a shared quantum-classical production infrastructure.