SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa421a336c02a0618920d27645ae74a43a0195c67b5c49d83798ff68719104dc' 
  AND token = 'BoaOJ9wu6jMsYYhD3vyYvninokmNUDGJBEg4gWfmROc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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