SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86aa1365e709e4a71a941fc18dcc2a7b4e5562367693b3493e3cf5c41193d7aa' 
  AND token = 'vSZErarBl+YSC6NpzBTeoR1ifNm2wuQhxFGgOGpo5P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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