SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6845a36e378a321cad2827e3ae62fe025b697f18b76d9d17acdaf7f56a4bc56c' 
  AND token = 'g8ABM2V0LU6qqdWrucVY+vWnHqr+oBLLCjh5XyzIjgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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