SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee7f61c76173d3ef789c756691095b16062a0f1e43bd9a9fe0f6221a09949f13' 
  AND token = 'Ya+5kvPVwAl8jmcQvavOiGdJhcd9y313JfkuKsnTqYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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