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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c4f6259b6e774f650860b223e1655bb10b6d338802221d52bdcb0f35eaa8ba8' 
  AND token = 'eYUTBU2QoOokFC6v6Z34lExIW7PIZmNU5yCDn/MI7p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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