SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f55f0d85924b292a3dba7e5702f130517c87726c9806128f1b1b4ed013d083f' 
  AND token = 'KGy4v54wgNCbfassmSr6XOZDqaWwxaUF6Av49vZvH/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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