SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '068a0292caba8567c34d94f38d46127d409b40f20aba0ce52d7c2e4b31d7dd86' 
  AND token = 'XFHTuV6zXmwVjLKje+0fKxKJ5yhXFUMQGm08BIaZzf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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