SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ffa8659611247612a991b1c4ed4e6bba60889367d73a87ea8f437ae3ca3163d8' 
  AND token = 'rVzcxjDZ+xw7JIE9EJJ3D7e4lDnLcX8bGCPxKBh6vko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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