SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08638add64ea1b88bb3989d7fcd2dd46cf847ad5c13b59a329eeb549c4fff075' 
  AND token = 'LZwy+U3GBTAMBgxynRpmnaE/ZrykH9qxbwtcv7QOoiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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