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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9018018ba7d5dbfb1e2ab247b0e5c842af1675f6423126d5f74f729ee1c547f6' 
  AND token = 'RuJvb17V/abblrLzXeFVOz+A4DWsyXfe1PFgTs1Ke08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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