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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd64ca02c34af94821af243e12ca3254dd34a5d9c8aef3eb271e856b1315e9b2' 
  AND token = 'AcneXkjC3xocpN8f71B7jTsNYyWSItZMw/TWiwBZrNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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