SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd644ed8d1c47bc17f77acd750eba7393c5b4c01ed63827f4e77e31369bcf9974' 
  AND token = '858KHRgA+lZJgOf1z4wZyP7V2zGRkgB9iyInrKHQOHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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