SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bada5a731e07f70bb992322f37c46941ac16f5d9e8feaa23f1a95fbc83dfa08a' 
  AND token = 'kr2WcLUHOo/RYuZRlXH5VOIMFMMjRNt2/NOzlGIJjQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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