SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5db071954e1991ebe49bb7f6441b2d3adaff054b08b14a36330c0855ff932b97' 
  AND token = 'mY9JYxF/z8uVZgbfS/CKuafj5d9/xBsw7IBKcLEX4R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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