SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '32eb85488c6bce97ec2db61cee7309d44a3720f31b8d3d88bf2fbe1b1f7d1bfe' 
  AND token = 'AyQ1AXYUG6ZKX8qDzLKl/BtlVOnaXHu5Val+aJ8TjV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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