SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ba5180620a6aa38b7cbf90e68ecf39a5d9247956deb345707fbc7c443059270' 
  AND token = 'k2AS6hRlP4J5LwZKAgPID6b8mHKs3M69bQZrmQzGqbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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