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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a58b3f8e3ee450f861f6256cb5c7be1c84ee3d78b8757c6875955ab6161b81e4' 
  AND token = 'QcevKVB2hPGpReTEQeI52fY6E/vnFstP9dICfbVDqYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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