SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9264cbc62a2b778f952d6e61693a38a40f777a5bcbd640275d816d95bdfc587e' 
  AND token = '8fICLy3azmix/M8B+On4rGQ1NFhreJX//vsZERewbOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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