SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '711fbdcfa3694737035672478f86e768e39845f1ddce8caab934f4c1de1951bd' 
  AND token = '/CbxGADHmZy8JxJq6KpxJmr0YDZw+tMvqvc4sApr6Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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