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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb606ed304ac1f09db3532cff2171484fc6e5f96afdecafd604f3efd6c81e316' 
  AND token = 'zRxbP+1vGXyy5dyx3In/EzvlkXT5M0ar8qPnrerSaMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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