SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b3286888fd77a85243d6b20570049bb3772e637c8c17b37e4fce167d334a086' 
  AND token = '7cWEnvm0Ey5Uw3JBKWK5Wgkk+h0jYzw1TNx+G913OcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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