SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a7207e124ef1a28f73b7078ae18558953459054fb47ab9c4e5093e5d813420f4' 
  AND token = 'qyGbovcBJVVsN5XfmUMA8jJNAFIPrLYUuIdZUMWz8Lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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