SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7af331071186572c4f947ca896684454bba9c39b0928b9c672f3900e36e2bcab' 
  AND token = 'lZ8XOQSP7mzSgTJ65/JBpzYgF3O5lPoGL4FWisA9744=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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