Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad7ec60129225ed96d1e9448995771e1b4c9352e1d110e95d55d16212b91e22a' 
  AND token = 'aUQhlMVyLv+BkBoMpMyQ2OV856epqkhMDAtUyUDVL/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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