SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9fb8f0407947397d555ae8455dd107c0259360452c77c1b9375c864f10457ab' 
  AND token = 'w37vakhRVgyG0d/+3Wjq/XLdK6XBTO4K4C7VP9b38aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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