SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c00da0517f99f2e796787ca722c0d6b67f79299489d0ed7dbff8ec7faa83d5ca' 
  AND token = 'vPVA593q9Futnp+K7MJHVamaIbhZVwBk4UJ9ZN/zrVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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