SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48b7b1596607f7268fd3509bb8caf0a01447c6aa7d04fd3b8862e00ec446b25a' 
  AND token = 'hyQMCSdWJYyvfMozCnWPk+taVwy9g6Gg1yZ9z7HhreY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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