SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9080af46b75079bb2a5d3a13acdb0fd72f7add16fbc484c562d80b965b242384' 
  AND token = 'jk79YhKFw/pb9Tta1VAQXLp9LzGsvqRsaSRePa95m3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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