SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f307d7a95b87dfaa3611c41ba544335093e39eb92cf571777d7a3144a43eb6d' 
  AND token = '1lBgHEGlhEJfvzSTYxRyPJXG1w1xJ98ImrMa/6vUSMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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