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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e2b7f5116369854b9a2083566b0f12aaa853287fbb8351efc2eddd799a27778' 
  AND token = 'ZHTbPT0qA2LrQkQqmKDpWGyL1P/9Oo3PsNzSkyO6/Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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