Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f8ba4f2d2b8b3a0185bfbfc0be9d487bfd0af7d6a72caa887b902054c7ccc12' 
  AND token = 'HxVtDCKD3D+QzXDb0qOCPjtPkGKiMJQ4y+qQ2v12/t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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