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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b5dad00f344fe0a83817118e34b9c73547c44f1bb07a228e8aaf64bc94ec3c4' 
  AND token = 'QWkBg2XNVCusInizI+RJb5T+XXFSaeKI8R2qfmw10qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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