SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26053f1fa25b50b6fec45429a2a79d76b3d1559d455b52002397af7d67b1fe31' 
  AND token = 'mRo+qmC+D1EzRbPHVP8RroSOs0NQ4/6otZj9IOFKTtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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