SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f955afa9514beb813fc905235a6dd9f436370d095086034a61b7a79ed903faa4' 
  AND token = 'C2O5zWrKWvkmIQnT9qzGkH3rTnl1JXlnB/Tr7ULSOxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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