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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b633a35a1607da320d06fd621692fca23fa81c7b5f8ef138d968a3f08f500a36' 
  AND token = '+2gs9mSYhIPCTK2po9hcOUfX/1gfQdMnbUc/f1HcWl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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