SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aaa1f1723e6840756640bbf7d9a24bf06cd239fbac9f9804f677eb14184d3a42' 
  AND token = 'LLcod7VtYvGWMot8R3BRfXa5WkUMttwYZhPlPvYB4z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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