SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dcc6d7e4e42a2f59d4f548b81d9553bd13628a19624b8ade80a9a1f6060479cc' 
  AND token = 'qlRnN4S0JdAnTYRHWQYswsfzJlvGS6Wr+mPP9u01buA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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