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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '232b921158b65c000f1e81b0ac79be9abafc0fc527bd277cdeee81b2bbfbf300' 
  AND token = 'jR1PZMcTv0Zk+xNvNypXhkDxdWzkHIPQXM5R2H7mXKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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