Machine learning-based intrusion detection systems (IDSs) can improve IoT security but often rely on large feature sets that increase computational overhead and limit deployment on resource-constrained devices. This paper presents a resource-efficient and explainable feature optimization framework for lightweight IoT intrusion detection using the CICIoT2023 dataset. A Random Forest model was used to rank feature importance and identify compact feature subsets. Experimental results show that a three-feature model achieved an MCC of 0.9622 while reducing the feature space by 92.1%, whereas a six feature model achieved an MCC of 0.9675 with an 84.2% reduction. Furthermore, a fifteen-feature model achieved an MCC of 0.9744, preserving 99.97% of the performance of the full 38-feature baseline model while reducing the feature space by 60.5%. SHAP-based explainability analysis validated the selected features and provided interpretable insights into model decisions. The results demonstrate that lightweight, explainable, and high-performance IoT intrusion detection can be achieved using only a small subset of carefully selected features, significantly reducing resource requirements with minimal loss of detection effectiveness.

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