SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '301298cb3c6b5334fbfa090c96f1e9805c8f3d6cd0cf66d79657e713b658cfc8' 
  AND token = 'J/xhtOKv8LqC0Di2n6nmSh15zjpivr1NrjVe7labuWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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